Netflixing a TV series with your spouse/friends/significant other, and watching episodes while the other party is out. This creates the awkward situation where you have to decide if the other party now has to watch episodes by themselves, or skip ahead to catch up.

Sorry babe, I'm already on Season 3, Episode 7 of "The Wire." Do you think you'll have time to catch up before we watch it together tomorrow? I know, I'm totally netflix cheating.